Kevin,
On my 77 NA 337, I had a shadin sensor plumbed in between the throttle body and flow divider (spider). So I just spliced the new red cube for the GI275 EIS in the same spot, immediately above #1 cylinder, held in place with adel clamps. Positioning & plumbing is the same on both engines. I put the fuel pressure sender on the flow divider.
Might need a snubber for fuel pressure if your new gauges are as sensitive as mine are.
PM for more details or you want to chat.
-LJ
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